bash-completion: Add version 2.3

> Programmable completion functions for bash [1]

```
> bee init https://github.com/scop/bash-completion/releases/download/2.3/bash-completion-2.3.tar.xz
creating bash-completion-2.3-0.bee from template '/etc/default/bee/templates/fallback'
```

There is a conflict with the package `util-linux`.

```
[…]
[BEE] -> saving bee-file bash-completion-2.3-0.bee ..
[BEE] /src/mariux/beeroot/bee-files/bash-completion-2.3-0.bee
‘/home/pmenzel/bee-files/./bash-completion-2.3-0.bee’ -> ‘/src/mariux/beeroot/bee-files/bash-completion-2.3-0.bee’
[BEE] Conflicts with installed package found: util-linux-2.28-0.x86_64:
[BEE]     /usr/share/bash-completion/completions/mount
[BEE]     /usr/share/bash-completion/completions/umount
[BEE]  -> saving build environment..
[BEE] /src/mariux/beeroot/build-archives/bash-completion-2.3-0.x86_64.beebuild.tar.bz2
[…]
```

[1] https://github.com/scop/bash-completion

bash-completion-2.3-0.bee

@@ -0,0 +1,83 @@
+#!/usr/bin/env beesh
+
+## this file was created by bee init and should be executed to build a
+## bee-package. (Additional hints are located at the end of this file.)
+
+###############################################################################
+## The source URL(s) define the location of the sources that will be
+## downloaded. Version variables may be used to simplify reuse of this bee-file.
+
+SRCURL[0]="https://github.com/scop/bash-completion/releases/download/${PKGVERSION}/bash-completion-${PKGVERSION}.tar.xz"
+
+###############################################################################
+## Add URLs/pathes to patch files to the PATCHURL array.
+## The sources will be patched in the order of the array.
+
+# PATCHURL+=()
+
+###############################################################################
+## Add filename patterns to the EXCLUDE array of files that should not
+## be added to you package but may be present in the image directory.
+
+# EXCLUDE+=()
+
+###############################################################################
+## Uncomment the next statement, if the software may not be able to be build
+## outside the source directory and need to be build inside the source
+## directory.
+
+# build_in_sourcedir
+
+###############################################################################
+## bee cannot detect buildtypes specified in subdirectories.
+## Sometimes packages "hide" the real sources in a subdirectory named
+## 'src' or 'cmake' or ..
+## use 'sourcesubdir_append' to specify this directory if known.
+
+# sourcesubdir_append src
+
+
+###############################################################################
+## Change the default (auto-detected) steps to
+## extract, patch, configure/setup, build and install the software.
+## Make sure the mee_install function does install everything to the
+## image directory "${D}"
+
+#mee_extract() {
+#    bee_extract "${@}"
+#}
+
+#mee_patch() {
+#    bee_patch "${@}"
+#}
+
+#mee_configure() {
+#    bee_configure
+#}
+
+#mee_build() {
+#    bee_build
+#}
+
+#mee_install() {
+#    bee_install
+#}
+# by default this may be 'make install DESTDIR="${D}"'
+
+###############################################################################
+##
+## Additional hints:
+##
+## The name of this bee-file should follow the following naming convention:
+##     pkgname-pkgversion-pkgrevision.bee
+##
+## You may remove all comments as long as SRCURL[0] is set.
+##
+## Everything in this file will be executed in a bash environment.
+##
+## Build the package by executing
+##     './pkg-version-N.bee' or
+##     'beesh ./pkg-version-N.bee'
+##
+## see http://beezinga.org/
+##